1968 年十勝沖地震における鉄筋コンクリート柱の剪断破壊に関する一考察

Abstract

Three series of tests on reinforced concrete columns were carried out with regard to the damage to reinforced concrete structures due to the Tokachi-oki Earthquake, 1968. In these tests the following items were preliminarily investigated; i) the eflects upon ductility of columns due to eccentricity of wall girders with regard to the axes of centroid of columns, ii) apprehensions of under-estimation of resisting capacity of columns for bending when one compares the bending resistance with the shear resistance for the purpose of providing the ductility of columns, iii) Shear resistance behaviors of columns of frame-works under repeated alternating lateral forces. The test results are compared with actual failing feature of columns damaged by the Tokachi-oki Earthquake. Some problems on shear failure of columns are pointed out, which should be further investigated ; especially we are interested in the relations between bond collapse and shear failure.